HI, thanks for using healthcare magic It is possible that the numbness or decrease sensation can be due to carpal tunnel syndrome. This can produce symptoms at night when a persons is sleeping. It is caused by compression of a nerve as it passes through a space by the wrists called the carpal tunnel. Early diagnosis and treatment would prevent any permanent damage. It is diagnosed based on history and also specific findings when examined by a doctor. There are specific examination tests that need to be done. Treatment includes medication, braces, certain exercises or surgery if needed. I hope this helps